What is pulverised coal? ... Coal which burns for long time. ANSWER: c. Coal broken into fine particles.

Why is pulverized coal used *?

Pulverized coal is mainly used because it is fine enough that its combustion rate is very high. The combustion of pulverized coal occurs mainly at gaseous state because in this state its combustion rate can be controlled easily.

What do you mean by pulverization Mcq?

Pulverization is a means of exposing a large surface area to the action of oxygen and consequently helping the combustion.

What is pulverized coal What are its advantages?

Advantages of pulverized coal

It increases the efficiency of the boiler. It makes possible the use of wide variety of coal. It reduces time of raising temperature of steam. Combustion of pulverized coal can readily be adopted to automatic control.

What is the superior quality of coal called MCQ?

Anthracite is a dark black form of coal and the highest quality coal. We should know that it is very hard, has low moisture content, and a carbon content of nearly 95%. When burned, anthracite can reach a very high temperature.

PULVERIZED COAL FIRING SYSTEM | THERMAL POWER PLANT COAL BURNING | GTU

36 related questions found

What is fineness of pulverized coal used in thermal power plant?

In the pulverized coal combustion system, coal ground to a very fine size (70–80% passing through a 200-mesh screen or 75 μm) is blown into a furnace. Approximately about 10% of the total air required for combustion is used to transport the coal.

How is the fuel selected in the pulverized fuel system Mcq?

Explanation: Most of the large power plants use pulverized fuel firing system since it is higher in its thermal efficiency. And selection of it mainly depends upon the size of boiler unit, type of the coal available, nature of load on the plant, load factor, cost of the fuel and availability of skilled labors.

What is pulverized and why it is used?

“Pulverization” (comminution, crushing, grinding) is the process of applying an external force to a (solid) material of a certain size to destroy it and reduce it into pieces that are smaller than the original size.

What is pulverized fuel used for?

Pulverised-fuel (PF) technology is widely used for large coal-fired power plants. In such systems, the fuel particles are injected pneumatically at high velocity (the primary air is used as a carrier) through a burner nozzle into the furnace (Fig.

What is pulverized fuel firing?

We refer the process of making the fuel powder as pulverization. ... This pulverized coal gets sprayed in the combustion chamber with a blow of hot air. The air used to spray the coal into the combustion chamber must get dry before entering the chamber.

Which is an advantage of using pulverized fuel Mcq?

Using pulverized fuel firer gives higher thermal efficiency, better control as per load on the plant and uses low grade coal.

What is the function of coal burners Mcq?

Explanation: Function of the coal burner is to burn pulverized coal in the presence of primary and secondary air in a boiler furnace.

How is the sizing of coal processed?

How is the sizing of coal processed? Explanation: Crushing makes the top surface of a coal furnish due to which it becomes easy to handle (by reducing its overall top size). Screening is used to group process particles into ranges by size. By appropriate sizing, transportation of coal becomes easier.

What is Pulverisation?

Definitions of pulverisation. the act of grinding to a powder or dust. synonyms: grind, mill, pulverization. type of: compaction, crunch, crush. the act of crushing.

What is PCI in blast furnace?

Furthermore, the amount of coke used can be reduced if huge amounts of pulverized coal are injected. ... Therefore, in recent years, Pulverized Coal Injection (PCI) systems are used in order to lower production costs as well as extend the life cycle of coke ovens.

How is electricity generated using pulverized coal?

Pulverized coal-fired electric power generation involves reducing coal size to a powder and conveying it with combustion air into a boiler where it is burned. ... The steam is then condensed back to a liquid and returned to the boiler to repeat the cycle (called the Rankine cycle).

How is coal pulverized in the ball mill?

How is coal pulverized in the ball mill? Explanation: The pulverization in ball mill takes place as a result of action between the balls and coal, as the cylinder they are put in is made to rotate. The cylinder is partly filled with various sized steel balls.

What is the function of superheater?

A superheater is a device used to convert saturated steam or wet steam into superheated steam or dry steam. Superheated steam is used in steam turbines for electricity generation, steam engines, and in processes such as steam reforming.

How is coal pulverized?

Pieces of coal are crushed between balls or cylindrical rollers that move between two tracks or "races." The raw coal is then fed into the pulverizer along with air heated to about 650 °F (340 °C) from the boiler. ... The powdered coal from the pulverizer is directly blown to a burner in the boiler.

What is pulverization of ore?

Pulverization or fine grinding is the ultra fine reduction of ore to liberate minerals for separation. Pulverizing includes multiple steps of crushing or grinding to reach the desired size.

What does pulverized mean in a sentence?

to reduce to dust or powder, as by pounding or grinding. to demolish or crush completely. Slang. to defeat, hurt badly, or, figuratively, render helpless: The Kid pulverized Jackson with a series of brutal lefts. He's a veteran nightclub comic who can pulverize any audience in seconds.

What are the major performance features of the CFBC boiler?

The major performance features of the CFBC boiler (circulating fluidizing bed combustion boiler) are: a) It has a high processing capacity because of the high gas velocity through the system.

What is the main reason for thermal pollution Mcq?

Explanation: Power plants are the main reasons behind growing thermal pollution. Because power plants use water as a cooling agent for cooling down their machines. This used water is in high temperature and it is released back to the water bodies and cause thermal pollution.

Which one is essential for combustion of fuel?

Three things are required in proper combination before ignition and combustion can take place---Heat, Oxygen and Fuel. There must be Fuel to burn. There must be Air to supply oxygen. There must be Heat (ignition temperature) to start and continue the combustion process.

What do you mean by pulverization of coal discuss the types of pulverized coal fired burners?

Hot air is passed through coal in the factor to dry the coal. The coal is then transferred to the pulverising mill where it is pulverised. Primary air is supplied to the mill, by the fan. The mixture of pulverised coal and primary air then flows to burner where secondary air is added.